Electric selector mechanism



Nom l, 1938. R. F". DIRKES ELECTRIC SELECTOR MEGHANISM Filed 00h50. 1936 4 Sheets-Sheet l mmm mmm INVENTOR R. F. DI RKES @iM/W ATT RNEY vNol. 1, 1938. F@l F, D|RKES 2,134,708

LECTRIC SELECTOR MECHANISM Filed Oct. 30. 1956 4 Sheets-Sheet 2 INVENTOR R F, DIR KES mmw A TORNEY Nov. l, 1938. V R, F, DERKES 2,134,708

ELECTRIC SELECTOR MECHANISM Filedct. 50. 1936 4 Sheecs-Sheet 5 @mi y rma AT ORNEY R. F. DIRIKES ELECTRIC SELECTOR MEQHANISM Sheets-Sheet 4 Filed Oct. 30. 1956 FIG. 8

III

FIG. 7

INVENTOR RF. DIR KES ATTORNEY Patented Nov. 1, 1938 ELECTRIC SELECTOR MECHANISM Robert F. Dirkes, Jamaica, N. Y., assignor to The Western Union Telegraph Company, New York,

N. Y.; a corporation of New York Application october eo, 1936, serial No. 108,492 35 omims. (C1. ris-34) This invention relates primarily to electric selector mechanism of the type employedfor effecting the selective operation of telegraph receivers, `such as printers, reperforators or like apparatus and which comprise a set of selectors adapted to be selectively conditioned or positioned in response to received code signal permutations of. two different line conditions or impulses extending throughout a denite number of successive time intervals. More particularly, the invention relates to a selector mechanism wherein the selectors aresetin combinations representative of received code signal permutations under the joint control of a locally driven member, usually a rotatable shaft with a series of cams thereon, anda member variably and selectively operated by an electro-responsive means, usually a magnet and the armature thereof, in response to the received code combinations of electrical conditions. Heretofore, telegraph receivers of various types such as page printers, tape printers, tickers and reperforators, have each employed selector units of different types. Obviously, this results in the manufactureand maintenance of a plurality of types of selector units and such practice does not lead to the highest operating and maintenance efficiency and -lowest manufactur- `design which may be readily removed from a telegraphreceiver as a'unit and replaced `by another unit when requiring repairs, adjustments or replacement.

Another object is to provide a selector mechanism whereby the recording of the preceding selectionby the recording mechanism may be effected simultaneously with the receiving and selecting of the following selection. Obviously, this lends itself to the high speed operation of the receiving unit.

A still further object is to provide a selector that has smooth and quiet operation with a minimum of wearing parts and adjustments. These and other objects and advantages of the invention will appear 'hereinafter in conjunction with the detailed description thereof.

For the purposeof illustration, the preferred embodiment of the selector mechanism is shown Vcombined with and selectively controlling a typewheel tape printer. The printing mechanism is fully disclosed in a copending application of V. R. Kimballret al.,led Oct. 22, 1935;. Ser. No. 46,198, and only such parts thereof will be described herein as are thought to be necessary for a coinplete understanding of the invention. It should be kept in mind, however, that theselector mechanism is readily adaptable to selectively control other types oftelegraph receiving units.

The preferred form of this invention is adapted to operate in conjunction with what is known in the art as the Simplex or start-stop five unit signalling code. .As is Well known, this signalling code comprises "a start impulse of uniform line condition followed by five impulses invarious combinations of two different line conditions which in turn are followed by a rest impulse of a uniform line condition and opposite to 'that of thestart impulse. The start and the ve variable impulses are of substantially uniform duration while the duration of the rest impulse is variable. Usually it is somewhat longer than the other im- 25 pulses and approaches the length-of one of the other impulses as the speed of the receiver approaches its maximum. Y

operatively associated with the selector mechanism and controlled thereby is a typewheelV positioning mechanism, a printingY mechanism and a paper tape feeding mechanism. These sub-combinations areso arranged that they may be easily and rapidly removed and interchangeably replaced when requiring repairs or adjustments. Thus the replacement of the whole receiver is not necessary.

The selector mechanism comprises a set of ve primary selectors, one for each variable impulse of the signalling code, an associated set of latches for`holding the primary selectors in their normal positionya set of secondary selectors or transfer members, a start magnet, a selector magnet and two locally power driven members, The rst locally driven member is released for operationby the start magnet in response to the start impulse and as it rotates in substantial synchronism with the received signals, it cooperates with the armatureof the selector mag- `net to selectively and successively operate the latches in combinations representative of the received signals. The latches which are selectively operated allow their associated primary selectors to assume their selected positions to which they are urged by individually attached springs, and

the latches which are not selectively operated retain their associated selectors in their normal unselected positions. The first power driven member releases the second power driven member which operates in timed relation to the positioning of the primary selectors to transfer the selection set up therein to the secondary selectors and thereafter restore the selected .primary selectors to normal whereupon they are free to be reselected in response to a following code combination of impulses.

relatively short interval of time, and thus give the tape advancing, printing and typewheel positioning mechanisms nearly the entire interval of one combination of impulses to perform their related functions.

The secondary selectors are individually and operatively associated with a set-of ve notched selector discs which selectively control the stopping position of the rotatable Vtypewheel corresponding to the received code combination.

The printing and paper feeding mechanisms function sequentially following the positioning of thetypewheel and are operated by individual cams on a thirdindependently rotatable member.

A continuously rotating electric motor furnishes power. for the operation of the various mechanism through appropriate gearing and clutch mechanisms while the armature of the selector magnet acts only to control the setting of the primary selectors; hence, the complete mechanism is capable of high speed operation.

A more complete and thorough understanding of this invention may be had from the following detailed description taken in conjunction with the accompanying drawings showing a preferred embodiment thereof, in which:

Fig. 1 is a front elevational View of a preferred embodiment of the invention;

Fig. 2 is a rear elevational view thereof;

Fig. 3 is an enlarged fragmentary sectional View taken about the center of the machine looking in the direction of the frear thereof;

Fig. 4 is a. fragmentarysectional.View taken on line 4-4 of Fig. 3; Y

Fig. 5 is a plan view of the mechanism shown in Fig. 4;

Fig. 6 is a sectional view taken on the line 6-6 of Fig 1; y

Fig. 7 is a sectional View taken on the line 1-1 of Fig. 6;

Fig. 8 is a sectional View taken on the line 8-8 of Fig. 6; and

Fig. 9 is a fragmentary view similar to a part of Fig. 3 and shows a modified form of the selector levers and latches. v

Referring first to Figs. 1 and 2, a base plate has attached to it by screws I2, a main frame casting comprising mainly two vertical plate sections I3 and I4 extending transversely of the machine and suitable integral connecting members therefor. These vertical plate members and their connecting members with various projections and sections of the main frame provide journal and mounting points for the various mechanisms. The connecting members and sections of the main frame will be given separate reference numerals when referred to hereinafter in this specification.

Referring torFigs. l 'to 3, the drive mechanism of the machine will nowY be described. A group Vof four posts I6 (two only of which are shown in Fig. 1) attached to theY base has mounted thereon, by screws I1, an electric motor M. A

The transfer and restoration operations take place sequentially and in a pinion I8 secured to the motor shaft I9 meshes with a gear 2|. The gear 2| is secured to a flanged hub 22 by screws such as 23, the hub 22 being attached by a screw 24 to an operating cam shaft 26 for rotation therewith. The operating cam shaft 26 is traversely journaled in flanged bushings 21 and 28 (Fig. 3) which are held in place by the bushing clamping members 29 and 3| respectively. The clamping members 29 and 3| are attached to the sections 32 and 33 of the main frame casting by screws 34 and 36, respectively. Fixed to the shaft 26 by a screw 31 is a flanged gear hub 38. A gear 39 is secured to the hub 38 by screws such as 4| for rotation therewith and meshes with a gear 42. The gear l42 is secured by screws, such as 43, to a flanged gear hub 44, best shown in Fig. 6, which in turn is secured by means of a pin 46 to a countershaft 41. The countershaft 41 is journaled in flanged bushings 48 and 49 which are held in the plate member I3 and in a section 5I of the main frame casting, respectively, by bushing clamping members 52, one of which is shown dotted in Fig. 3. Fixed by a screw 53 (Fig. 6) to the left hand end of the shaft 41 for rotation therewith is a gear hub 54 which carries a gear 56 by means of screws 55. Referring to Fig. 2, gear 56 meshes with an idler gear 51 which in turn meshes with with a selector cam shaft drive gear 58. Idler gear 51 is xed to a hub 66 by means of screws 59, the hub 68 being ro-tatably mounted on a stud in the plate frame member I3. In mesh with the idler gear 51 is another idler gear` 6| fixed to a hub 62 by means of screws 63, the hub 62 being rotatably mounted on a stud 64 extending from the plate frame member I3. A typewheel shaft drive gear 66 meshes with the idler'gear 6| and is driven therefrom. The typewheel shaft gear 66 and the selector cam shaft gear 58 serve to rotate their respective shafts in a manner that will be hereinafter described in connection with their respective mechanisms.

Selector mechanism Referring now to Figs. 2, 3, 6 .and 8, the arrangement and operation of the selector mechanism will now be described. As hereinbefore described, the gear 58 is continuously rotating due to the power communicated thereto from the continuously rotating motor M through the described gear train. The gear 58 is xed by screws 61 to a flanged hub 65 loosely mounted on a selector cam shaft 68. The selector cam shaft 68 is traversely journaled in flanged bushings 69 and 1| which areheld by bushing clamping members 12 and 13 attached to the top of sections I3 and 14 of the main frame casting by screws 16 and 11, respectively. The flange of the gear hub 65 carries a series of three pins 18 (Figs. 6 and 8) equally spaced around the left face thereof and extending axially therefrom. These pins engage radial slots 19 in associated Bakelite segments 8|. A groove on the outer edge of the segments 8| has therein a circular coiled radially contractible spring 82 which causes the inner surfaces'of the segments 8| to be frictionally engaged with a sleeve 83, extending from the right hand Vface of a hub 84. The hub 84 is xed to the selector cam shaft 68 by a set screw 86 for rotation therewith in abutting relation with the left side of the gear hub 65. The right hand side of the gear hub 65 is in abutting relation with the left hand face of the flanged bushing 69. It can therefore be seen from the above description that, as'the gear 58 and hub 65 rotate together, the selector cam shaft 68 will tend to rotate therewith due to the action of the segments 8| irictionallyfengaged with the sleeve 83 of the `lnub84 but is normallyv prevented from as will be hereinafter described.

Attached .adjacent the upper left hand face of the plate section I3 of the main frame, bytsc'rews doing so,

`88, as seen in Fig. 6, is a start unit .mounting f limits hereinafter described. Attached to` the `screws' 91 to the bracket 94 is the start magnet plate 92 is a spacing plate 93, Figs. 2 and 6, to which in turn is adjustably attached by screws. 96 a start magnet mounting bracket 94. Secured by yoke 98 which by means of a screw 99 secures the start magnet I8| thereto and at the upper end supports a rod |02 upon which is pivotally mounted the bell crank shaped armature |63; From an upwardly projecting arm |04 of the bracket 94 extends a threaded stud |05 upon which are two self locking anged nuts |06 `and |01. -The ilanges of these nuts |06 and"|0r1 are engageable with the vertical arm ofthe bell crank `armature |03 and thus limit the movement of the armature. Riveted to the vertical arm of the armature |03 is a striking plate |88 which is .in operative relation with a` stop-arm |09 clamped adjacent the end of the selector cam shaft 68, for rotation therewith, by a screw I. i Y

In the normal or rest position. ofthe printer, the start magnet I8| isenergized and the adjustment of the` flanged nut |06 is such as to allow the striking plate |88 to be engaged vwith the stop-arm |09 and thereby hold the selector cam shaft from rotating. When the stop-arm |09 is .engaged with the striking plate |08, the hereinbefore mentioned Bakelite segments 8| slide on the circumference of the sleeve 83, Fig. 6.

A retractile spring |I2, Fig. 2, has one end attached to the vertical arm of the armature |83, the other end of `which is attached to the left hand end of an adjusting screw |I3 supported inY an `upwardly projecting arm I4 of the bracket 94. The spring tends to return the armature |03 to its retracted position against the action of the magnetic influence of the magnet |.0I.

A stud I I6 extends through a curved slot I I1 in the bracket 81 and through a hole in the orienting plate 92. A thumb nut I I8 is in threaded engagement with the stud I I6 and by `loosening the thumb nut the orienting plate 92 with its attached members may be rotated within the limits of thecurved slot I I1 in the bracket 81, with the shaft 68 at the center of rotation. Thus the stop `or rest position of the shaft 68 may be changed and this operation is known in the art as orienting. The purpose of orienting is to- Vary the rest position of the selector shaft so that the individual selector positioning operations take place atsubstantially the mid-portion or most effective portions of respective signal periods. Ascale 90 etched on the orienting plate 92 cooperating with a pointer 95 secured to the bracket 81, serves to indicate the relative amount of orientation.

Secured to the selector cam shaft 68, Fig. 6, by a pin I I9 is a cam sleeve I2I. A single hump cam |22 and live notched selector cams, indicated in general at |23, are clamped to the sleeve |2I for rotation therewith by a nut |24, in threaded engagement with the right hand end thereof.

Removably attached by screws |26, Figs. 1 and 3, tothe upper part of the plate section I3 of the main frame casting is a `selector unit mounting plate |21 on which are supported all the elements of the selector mechanism with the exception oi the selector shaft 68. Thus the complete selector unit is readily removable when requiring repairs, replacement of parts, or adjustments. Adjustably secured by screws |28 to the uppersection of the selector unit mounting plate |21 is a selector magnet casting I29,.Figs. l, 2 and 3, which has two locating pins |3| extending horizontally therefrom. On the locatingV pins is a laminated magnet yoke |32 and a front plate |33. Two screws |34 which extend through a magnet coil clamp |36, the front plate |33, and the magnet yoke |32, are threaded into the selector magnet casting |29 and clamp said members. thereto. The magnet clamp |36 holds a. hollow circular selector magnet coil |31 through which extends a horizontal laminated armature |38. The armature |38 is pivoted at its left hand end, as seen in Figs. l and 3, on a pin |35 supported by the selector magnet casting |29 and the front plate |33. Secured to the'right hand end of the armature |38 is an armature eX- tension `|39 which has the right hand end bent to `form a right angle with the main section thereof, extending toward the rear of the printer, the purpose of which will be hereinafter described,l Supported in two horizontal projections I4I of the magnet casting |29 are two adjusting screws |42, one above and one below the armature extension |39. The ends of these screws cooperate with an armature hammer |40 to limit the movement of the armature |38 and the armature extension |39.

Extending horizontally from the selector unit mounting plate |21 are a series of studs |43, Figs. l and 3, which have arranged thereon a plurality f of selector guide plates |44 and spacers |46 intermediate therebetween. The plates |44 and spacers |46 are clamped together by nuts |41 in threaded engagement with ends of the studs |43.

A series of five selector lever latches, indicated in general at |48 in Fig. 3, are located in a substantially vertical position one behind the other intermediate with the guide plates |44. The lower ends of the latches |48 are horizontally bifurcated and are all slidably mounted thereat on a pin |49 extending horizontally from the mounting plate |21. Projections |5I` adjacent the center of each latch |48 are operatively associated with the disc cams |23, each latch being associated with and in operative relation with a different one of the cams. At a point above the projections I5I on the latches |48 areattached individual tension springs |52 which tend to rock the latches in a clockwise direction with the pin |49 serving as the center of rotation, and keep the projections I5| in contact with their associated cams |23. springs are secured to a spring mounting bracket |53 which is adjustably secured to the plate section I3 of the main frame casting by a screw |54. The upper end of each latch |48 has a rightwardly extending projection |56 which is in operative relation and coacts with the right hand bent end of the armature extension |66 to cause the selective operation of the latches |48, as will be hereinafter described.

A series of five selector levers indicated in general at |51in Fig. 3 are located betweenthe guide The other ends of the plates |44, one behind the other in a substantially vertical position. 'I'hese selector levers |51 are bifurcated at both ends and like the latches |48 are slightly thinner than the spacers |46 and are therefore freely movable between the guide plates |44. Individual spring |58 attached to the selector levers |51 holds said levers to the right with the lower ends thereof` against spacers on the stud |43 and the upper end against another stud |43 between the bifurcated upper end. These springs |58 tend to pull the selector levers k|51 down into their selected position as shown by the dotted outline thereof in Fig.` 3 but are prevented from doing so by means of a rightwardly extending horizontal projection |59 which normally engages with arleftwardly extending horizontal projection |6| on associated latches |48.

The manner in which the selector-.levers |51 are selected in a combination in response to and in accordance with a combination f code impulses will now be described. The normal or rest condition of the line is closed and thus an electrical impulse is transmitted for this condition. Therefore, when the selector mechanism is idle, the start magnet |0| and selector magnet |31, Fig. 2, which are connected in series with the line, are both energized. yThe start magnet |0I, Fig. 2, being energized, causes the armature |03 to be in engagementwith the stop-arm |09 which is secured to the selector cam shaft 68 and thereby keeps said shaft'from rotating.

As previously described, the start impulse is of opposite line condition than the rest impulse and is an open line condition. When the start impulse is received on the start magnet, it will therefore allow the spring ||2 to move the armature to its retracted position, as limited by the nut |01, and in so doing moves the striking plate |08 out from beneath the end of the vstop-arm |09. The stop arm |09 and the selector shaft 68 are then free to rotate due to the rotative power communicated thereto through the described frictionv clutch comprising the rotating Bakelite segments 8| (Figs. 6 and 8) frictionally engaged with the sleeve 83 which is secured to the selector Shaft 68.

The speed of rotation of the selector shaft 68 is such that it will completea revolution in slightly less time thanthat required for a complete code combination to be received, as is the general practise in practically all start-stop telegraph mechanisms. The stop position of the selector cam shaft is adjusted, as described, to compensate for line conditions which may tend to vary the length and effectiveness of the start impulse so that during the midportion or most effective portion of the first Variable signalling impulse following the start impulse, the selector cam shaft 68 will have rotated to a position to bring a notch |62, Fig. 3, in the first selector cam |23 into operative relation with the horizontal projection on the first selector lever latch |48. If the first variable impulse represents a spacing or open line condition, the selector magnet |31 at this time will be deenergized and therefore will have allowed a retractile spring |63, secured at one end to the armature extension 39 and at the other end to an adjustable spring anchor member |64 on a stud |43, to have moved the armature |38 and varmature extension |39 to their lower or spacing position. In this position of the armature extension |39, the bent right hand end 66 thereof will be below and out of Voperative relation with the projections |56 at the upper end of the selector lever latches |48. Thus when the notch |62 in the first selector cam |23 comes opposite the projection |5| on the rst selector lever latch |48, the associated spring |52 will cause the `latch to rock in a clockwise direction with'the pin |49 acting as a pivot therefor. As the selector cam shaft 68 continues to rotate the notch |62 passes out of engagement with the projection |5| and cams the selector lever latch |48 back into its original or normal position. During this movement of the selector lever latch |48, the projection |6| thereon remains engaged with the projection |59 on the associated selector lever |51; thus the position of the associated selector lever does not change on the receipt of spacing impulses or no-current intervals but remains in its normal or unselected position. 'Ihe operation ofthe selector lever latches |48 is quite different on the receipt of associated marking impulses or current intervals and the operation of one will now be described in conjunction With the receipt of a marking impulse. For marking signalling conditions the selector magnet |31 is energized and causes the armature |38 and extension |39 to be in their upper positions. As stated above, the speed of rotation of selector cam shaft 68 and spacing of the notches |62 in the selector cams |23 are such that the notches |62 successively come into operative relation with the projections |5| of their associated selector lever latches |48 in substantial synchronism with the mid-portion or most effective portion of their respective signalling conditions.

Assume that the selector magnet |31 is energized in response to a marking condition and consequently moves the armature |38 and extension |39 to their upper position against the action of the spring |63. At the most effective portion of this marking impulse which is some time after the positioning of the armature |38 and extension |39 to their upper position, the cam |23 corresponding to the associated marking impulse will have rotated sufficiently to bring the notch |62 therein into operative relation with its associated selector lever latch |48. The spring |52 attached to the latch 48 thereupon pulls the projection |5| into the notch |62 in the associated cam |23. As the projection 5| starts to enter the notch the spring |52 rocks the latch |48 in a clockwise direction about the pin |49. However, with the selector magnet |31 energized, the section |66 of the armature eX- tension is in front of and in operative relation with theprojection |56 on the upper end of the latches 48. Therefore, after the latch |48 lhas rotated a slight amount in a clockwise direction about the pin |49, the projections |56 and |66 of the latch and armature extension respectively engage and consequently stop further rotation in this direction. However, at this time the projection |5| will not have entered to the full depth of the notch |62 in the cam 23 and as the spring |52 continues to exert a tension on the latch |48, it will cause the latch to rock in a counter-clockwise direction with the projection |56 in contact with the armature extension |66 acting as the pivot point therefor, the lower horizontal bifurcated end sliding to the right on the pin |49.

Some time before the spring 52 pulls the projection |5| on its associated latch |48 to the full depth of the notch |62 in the cam |23, the latch |48 will have rocked a sufficient amount to disengage the projection |6| thereon with the projection |59 on the associated selector lever `lector cam shaft.

|51. Thereupon the spring: |58 is effective on its associated selector lever |51 to pull it down into its marking or selected position as shown by the dotted outline thereof in Fig. 3. A pin |61 extending horizontally from the selector unit mounting plate |21 beneath the horizontal section |68` of all of the selector levers |51 limits the downward movement of the selector levers |51. Subsequent to the unlatching` operation and prior to the receipt of the following signalling impulse the projection passes out of the notch |62 in its associated cam |23 and is re-4 turned to its normal position. Each selector lever |51 has an associated latch |48 `which in turn is associated with a From the above it is evident that for spacing signal impulses the associated selector` levers |51 remain in their normal or unselected positions and that for marking signal impulses the associated selector levers |51 are positioned to their operated or selected positions.` Thus the electrical signalling conditions are transferred into and represented by the mechanical selections of the selector -levers |51.

i At a predetermined point in the revolution of the selector cam shaft 68, the high part of the hump cam |22 engages the top-right end of a substantially T-shaped horizontal lever |69, the left end of which is pivoted on` a pin |1|, which extends from the `selector unit mounting plate |21. The lower-right hand end 'of the lever |69 rests on the upper horizontal section of an operating cam trip lever |12,` Figs. 1, 3 and 6, which is pivoted on ashoulder screw |13 in a section `|1|| of the main frame casting. Thus for every revolution of the selector cam shaft 68 the operating cam trip lever |12 will be tripped, for a purpose which will be hereinafter described.

Loosely mounted adjacentrthe left hand end of the operating cam shaft 26, Figs. 3, 4 and 5,

is a` hub |16. Attached to the hub |16 by screws A collar |83 attached to the shaft 26 by a pin |84 in abutting relation to the flanged bushing 28 prevents the shaft 26 from moving to the right. A sleeve' member 86 'slidably mounted on the sleeve |82 is operatively connected `to the hub |18 by means of interengaging tooth members |15, Fig. 1. The sleeve member` |86 comprises the driven member of a ratchet clutch by means'of which the independently rotatable operating cam |19 is rotated. A spring |81, Fig. 3, coiled about a sleeve portion of the'hub |16 tends to keep teeth |88, disposed on the right hand face of the sleeve member |86, engaged i with similar teeth |89 disposed on the left hand members respectively are engaged, the operat- 70 the circumference of the `driven member |86, is

ing cam |19 will rotate with the shaft 26.

A side cam surface |9|, Fig. 1;, disposed on in operative relation with a cam follower |92, i Fig. 6, secured tothe lower end of the trip lever `With the teeth |88 and |89, Figs. 1` and 3, engaged and the operating cam |19 rotating with cam |23 on the se- When i the the shaft 26, the side cam surface |9| is so arranged that it engages with .the cam follower |92 onthe trip lever |12 at a predetermined point in its rotation and as the sleeve member |86 rotates further, the action of the sidecam surface |9| on the cam follower |92, slides the sleeve member to the left and consequently the teeth |88 thereon. are disengaged from the teeth |89 of the driving member 38. A further projection of the side cam surface 9| which is substantially parallel with the shaft 26 then engages the cam follower |92 on the trip lever and brings the operating cam assembly to a stop in its predetermined rest position. When the trip lever |12 is tripped as hereinbeforedescribed, the cam follower |92 and the side cam surface |9| are disengaged which allows the spring |81 to slide the driven member |86to the right and cause itsteeth |88 to be engaged with teeth |89 of the driving member 38 whereupon the operating cam will rotate with the operating cam shaft 26. Since the cam |22 and the T-lever |69 actuate the trip lever |12 for a short interval of time, the trip lever is quickly returned to its normal position by an attached spring |93, Fig.` 6, whereupon the cam follower |92 rides on the circumference of the sleeve'member |86 in the path of the'side cam surface '|9|. Thus as` the operating cam |19 nears the end of its revolution, the side cam surface |9| and `the trip lever |12 cause the disengagement of the ratchet clutch as heretofore described and bring` said operating cam to a stop in its predetermined rest position. The shaft 26 is gearedto rotate a substantial amount faster than the selector cam shaft 88 Yand it will therefore complete its revolution and be stopped in its rest position before the cam |22 can actuate the trip lever |12 to again release the sleeve member |86 in conjunction with a following signal code combination.

`The operating cam 19 is a disc with a portion |94 thereof, shown dottedin Fig. 5, disposed axially toward the left end of the machine. A gathering cam |96 and a reset cam |91 attached to the'left and right sides respectively of the operating cam disc |19 rotate therewith. rFhese three cams, namely, the operating cam |19, the gathering `cam |96 and the reset cam |91, comprise what will hereinafter be referred to as the operating cam assembly. A latch lever |98, Fig. 4, is pivoted on a shoulder screw |99 screwed into a plate 20|, which in turn is secured to the section 32 of the main frame casting. The end of the latch lever |98 is engageable with an edge of the gathering cam |96 when the operating cam assembly is inits stop position. A spring 292 attached to the latch lever |98 and toa pin in'the plate 29| normally keeps the latch lever |98 in operative relation withthe `gathering cam |96. The purpose of the latch lever is to prevent any rebound or"rotation in reverse direction of the operating cam assembly that might occur due to its sudden stop by the operating cam trip lever |12.

The bifurcated lower ends 204, Fig. 3, of the selector levers |51v are so placed in relation to the operating cam |19 that when they are in their selected or marking position, theystraddle the` disc of the operating cam |19, as shown by thedotted outline of a selected selector lever.

A series of five code disc transfer levers indicated in general at 261| in Fig. 3 are located one behind the other between the guide plates |44 and arehorizontally slidable to and fro between predetermined limits.` The spacers |46 on the studs |43 guide the transfer levers 204 in their horizontal movements and are slightly thicker than the transfer levers which permitsthe levers to slide easily between the guide plates |44. Each transfer lever 204 is aligned with and associated with one of the selector levers |51 and, as will be hereinafter described, with a selector lever |51 in its lower or selected marking position, the bifurcated end 203 thereof is adapted to be operatively engaged with the right hand end of its associated transfer lever. Also, with a selector lever in its upper or unselected spacing position the bifurcated end thereof is not adapted to be operatively engaged with either its associated transfer lever or the cam |19.

Referring to Figs. 3, 4 and5, as the operating cam assembly starts to rotate, when released as heretofore described, and has completed about a quarter of a revolution, the gathering cam |96, attached to the Voperating cam |19 and rotating therewith, comes into engagement with downwardly extending projections 206 on the right hand ends of the transfer levers 204. Due to the shape of the gathering cam |96 and its rotating movement, it progressively slides the code disc levers 204 which happen to be in their left hand position, to4 their right hand position. Some or all or none of the transfer levers 204 may be in their left hand position, depending on the previous character selected. Thus, following the movement of the gathering cam, all the transfer levers 204 are disposed to the right and in position'to have the selection that is set up in the selector levers |51 transferred to them. As the operating cam assembly continues to rotate, the operating cam disc |19 slides in the bifurcated'ends 203 of the selected selector levers |51 and after about half a revolution `of said disc, the displaced portion |94 of disc |19 actuates the bifurcated ends of the selected selector levers to the left, thereby sliding corresponding ones of said transfer leversto the left into their marking position. As the bifurcated ends 203 of the unselected selector levers |51 are above and out of operative relation with the operating cam |19 these unselected levers will not be affected by the rotation of the operating cam |19. Therefore corresponding transfer levers 204 of these unselected selector levers will remain in their right hand or spacing position, as placed by the gathering cam |96.

Immediately following the movement of the lower ends of the selected selector levers |51 to the left by the displaced'portion |94 of the disc |19, further rotation of the disc |19 rotates the displaced portion out of operative rotation with selector levers and inso doing allows their attached springs |58 to return them to the right into their selected position. Further rotation of the operating cam assembly then brings the reset cam |91 into operative relation with the bottom of the selected selectorlevers |51 and due to the shape of the reset cam and its rotating movement, it successively raises all the selected selector levers. f As the selected selector levers |51 are thus raised, the upper surfaces of the projections |59 thereof which are beveled, engage the lower beveled surfaces of'y the projections |6| of associated latches |48 and the selectors are thereby cammed a slightamount to the left. When the selectors are high enough so that the projections |59 and |6| on thev selectors and latches, respectively, are clear of one another, the selector springs |58 pull the selectors back into their vertical position.` The reset cam |91 subsequently passes out from beneath the selectors |51 and allows the projections |59 thereon to engage with the projections |6| on associated latches |48 and thereby hold them in normal position. Thus all the selectors are in their normal latched position ready for lthe next selection. 'Ihe tension of the springs |58 and |52 attached to the selectors |51 and latches |48, respectively, is so adjusted that when the selected selectors are being raised by the reset cam |91, there is no movement of the lower ends of the latches |48 to the right, all the movement for relatching being in the selectors |51. As the latches |48 are not actuated on the relatching operation, no time is required for them to settle down and they are immediately operable in response to the next selection, which feature contributes to the high speed operation of the selector.

The transfer levers 204 remain in either their left or right hand positions corresponding to the selection transferred to them from the selector levers |51 until the first part of the subsequent revolution of the operating cam assembly, whereupon all the transfer levers in their left hand position are again moved back into their left hand position bythe gathering cam |96.

Individual to each transfer lever 204 is a transfer lever detent pawl 201. These detent pawls 201 are pivoted on a common stud 20S attached to the selecting unit mounting plate |21. Individual springs 209 attached to an arm of each detent vpawl and to a spring post 2| keep said pawls engaged with a wedge-shaped portion 2|2 of their associated transfer levers 204. The detent pawls 201 in conjunction with their associated springs 209 act as jockeys and tend to keep the transfer levers 204 in either their left or right hand position as set by the operating or gathering cams respectively.

Adjacent the left hand end of each of the transfer levers 204 are rounded-end depen-ding projections 2|3 which are engaged in slots 2 I4 of associated code discs 2| 6. The discs 2|6 are ve in number, corresponding to the number of selectors and comprise the selecting elements of a drum type typewheelstop unit, indicated in general at 2|1. The construction of this typewheel stop unit is fully described and shown in copendingV applications Ser. Nos. 34,080, 42,692 and 46,198, and it is thought that a complete description is not necessary herewith. In general, the typewheel stop unit 2|1 comprises a set of five differently notched code discs 2|6 which are rotatable from one of two positions to the'other by the transfer levers 204 as the transfer levers are moved bfy the gathering cam |95 and operating cam |19. A typewheel shaft 2 I8 extendsI through the code discs 2 |6 and constantly tends to rotate due to the power communicated thereto through a slip friction clutch indicated in general at 2|9, Fig. 2, similar in construction to the selector cam friction clutch previously described in connection with Fig. 8. Fixed to one end of the typewheel shaft 2|8 for rotation therewith is a typewheel 22|, Fig. l, which has in a single row, on Athe periphery thereof,'both upper and lower case` characters. Also fixed to the typewheel shaft 2|8 for rotation therewith is a typewheel stop arm 222, Fig. 3, the end of which is in operative relation with a series of stop elements 223. The stop elements 223 are at right angles and equally spaced about the circumference of the code discs 2| 6 and areV guided in radial slots in two guide plates adjacent either end. 'I'he code discs 2|6 have V-shaped notches formed on the in the path of the stop arm 222.

periphery thereof and when the discs are selectively positioned by the transfer levers a row of notches will be in alignment, the notches being formed as is well known in the art so that a row of notches exists for each setting combination thereof. The stop elements` 223 are urged into' engagement with the code discs 2|6, by springs not shown, and when a row of notches therein occurs one of the stop elements enters the aligned notches', thus placing one end thereof As the stop arm 222 rotates, it engages this selected stop element 223 thereby arresting the typewheel in a selected the other `by one or the other of two stop elements. These two stop elements are selected in response to signals corresponding to case shift and unshift signals and position the shift disc code is increased to be nearly equal to that of a six unit code, although all possible selections .are not employed in the embodiment shown. When the five selector discs 2 I 6 are all returned to normal by the action of the gathering cam |95 acting on the transfer levers 204, the selected stop element is cammed out of the notches in the discs 2|6 by the movement thereof, and thereby releases the stop! arm 222 for rotation. The stop arm 222, typewheel shaft 2|8 and typewheel 22| then rotate until the stop cam engages another stop element, selected by a new combination of settings `of the code discs 2|6 in response to a new code combination of impulses. Y

The printing and tape feeding mechanism will now be described. The mechanism is substantially the same as that shown and described in the has clamped to the top right hand side thereof, a

bushing clamping member 221. `The bushing clamping member 221 holds a flanged bushing 228 in place in which is journaled the right hand end of an independently rotatable shaft 229. An-

other flange bushing 23| clamped to asection 232 of the main frame casting serves as another journal for the shaft 229 adjacent the center thereof. The shaft 229 and the above-mentioned countershaft 41 are on the same axis and the shaft`229 is adapted to be rotated from the countershaft by means of a ratchet clutch. The ratchet clutch comprises a driving ratchet integral with the hub 44, attached to the continuously rotating shaft 41 for rotation therewith and a driven member 233.

Teeth 234 disposed on the-right hand face of the driving ratchet 41 are adapted to be operatively engaged with similar teeth 23B disposed on the left hand face of the driven member 233. The

` driven member 233 is operativelyengaged with a hub 231 `by means of inter-engaging tooth members 238, shown dotted in Fig. 6. Hub 231 is fixed to the shaft 229 for rotation therewith by means of a screw 239. Thus the driven member 233 is keyed to the shaft 229 for rotation therewith but is adapted to be slid along said shaft to bring itsA teeth 236 into or out of engagement with the teeth 234 on the driving member 44. A circular coiled spring 24| around the sleeve portion ofthe the frame section 232.

driven member 233 tends to keep the driven member engaged with the driving member.

A side cam surface 242, Fig. 7, formed on the hub portion of the driven member 233 is adapted to be operatively engaged with a cam follower 243 on'the lower end of a trip lever 244. The trip lever 244 is pivotally mounted on a stud 24B in A pin 241, Figs. 1, 4, 5 land '7, secured to thehub |18 of the operating cam assembly is arranged to engage the upper end of the lever 244 and `cause the cam follower 243l on the `lower end thereof to be withdrawn from engagement with the side cam surface 242, whereupon the driven member 233, by action of the spring 24|, Fig. 6, is free to slide to the left and engage the continuously rotating driving member 44 and rotate therewith.

The driven member 233 upon engagement with the drivingv member 44 will be rotated thereby until cammed` out of engagement therewith and stopped in its predetermined stop position atthe end of one revolution. After being tripped, a spring 259, Fig. 7, attached to the trip lever 244 returns said trip lever to its normal position, whereupon the cam follower 243 rides on the hub of the then rotating driven member 233 and in the path of the side cam surface 242 until near the end of a revolution, at which time the cam follower 243 re-engages the side cam surface 242 to force the clutch members apart. The pin 241 on the operating cam assembly is adapted to actuate the trip lever 244 during the latter part of the revolution of the operating cam assembly.

A latch armY 248 is pivotally mounted on a shoulder screw 249 in a plate 25| attached to the frame section 232. The end of the latch is en'- gageable with a radial shoulder 252 on a disc 253 integral with the hub 231. A spring 254 attached to the latch arm 248 tends to keep said arm and disc 253 operatively engaged. The purpose of the latch is to prevent rotation in a reverse direction, or rebound of the shaft 229 and its attached members, due to their sudden stop when the cam follower 243 engagesthe side cam surface 242 on the driven member 233.

The shaft 41 is geared to rotate a substantial amount faster than the selector camshaft 68 and therefore the shaft 229 will complete its revolution and be in its restor normal position before the trip lever 244 is again actuated to initiate the rotation of `the shaft Y229 in conjunction with another code combination of impulses.

A cam sleeve 251 is attached to the shaft 229, Fig. 6, for rotation therewith, by a pin 256. The left and the right hand ends of the sleeve 251 are in abutting relation to the flanged bushings 23| and 228, respectively, and prevent longitudinal movement of the shaft 229. The cam sleeve 251 has a section thereof of smaller diameter'upon which are placed a print cam 258, a tape feed cam 259 and a spacing collar 26|. The cams and spacing collar are clamped against a flanged portion of the sleeve 251 to rotate therewith, by means of a nut 232 in threaded engagement with the right end of the sleeve. Y

Referring to Fig. l, a plate 253 is attached by screws 234- to the front of section, i4 ofthe main right hand end thereof, held in engagementwith the periphery of the' print cam 253 by a spring 259. As the cam follower 26B enters the depression in theprint cam258 thespring 269 causes the left hand end of the print lever 266 to force a paper recording tape P against the typewheel 22| and thereby take an impression therefrom. Concomitant with the printing operation, a cam follower 21|, Fig. 6, on the right hand end of a tape feed lever 212 enters the depression in the tape feed cam 259 and allows the'spring 269 to rotate the tape feed lever 212 about its mounting screw 213, Fig. l. A paWl 214 pivotally carried on the left hand end of the lever 212is in operative relation with a toothed ratchet 215 rotatable with a feed roller 216 both of which are pivoted on the shoulder screw 261.` A pressure roller 211 pivoted on the left hand end of a lever 218, which in turn is pivoted on a shoulder screw 219, holds the paper P in engagement with the feed roller 216 by means of a spring 28|. Thus for every revolution of the tape feed cam 259, the feed roller 216 is rotated an amount equal to one tooth of the ratchet 215 therebs7 advancing the tape P an amount equal to one letter space to present a fresh section of the tape in printing position. A retaining pawl 282, only the upper end of which is shown in Fig. l, is pivoted on a shoulder screw in the plate 263 and has the lower end engaged with the ratchet 215. This pawl 282 prevents reverse rotation of the feed roller 216 as the operating pawl 214 moves backward to pick up a new tooth. Two substantially U- shaped members 283 and 284 guide the tape P to and from the printing position respectively.

A modification of the selector levers and selector latches isshown in Fig. 9 and their construction and operation will now be described. The elements cooperating with these modified selector levers and latches, viz., the armature extensions |39 and |66, the latch springs |52, the selector cams |23, the pin |49, the selector springs |52 and the operating cam assembly are exactly the same as those employed in the preferred embodiment, and therefore the same reference numerals are used, whereas the modified selector levers and latches have new reference numerals. The modified selector levers and latches are located one behind the other between the guide plates |44 and are indicated in general in Fig. 9 by reference numerals 29| .and 292, respectively. The operation of the modified selector levers 29| is exactly the same' as that of the preferred selector levers |51. The modified latches 292 are pivotable about vonly one point and pivot about this point to unlatch associated selector levers 29| or are restrained from pivoting about this point and thereby retain their associated selector levers in a latched position in accordance with received signal impulses. The latches 292 are pivotally mountedat their lower ends on the pin |49 and each have a projection 293 adjacent the center thereof in operative engagement with an associated selector cam 23 as held by the attached spring |52. Opposite the projection 293 on each ofthe latches 292 is another projection 294 which engages with a projection 296 on each of the selector levers 29| and normally holds the selector levers 29| in their normal position. The upper end of each latch has a projection 291 which cooperates with the armature extension |66 to prevent or allow the pivoting of the latches 292 as will be hereinafter described.

The rotation of the selector cam shaft 68 is initiated in response to the start impulse as heretofore described, and it rotates at such a speed to bring the notches |62 in the selector cams |23 into association with the projections 293 on the latches 292 in synchronism with the received signalling impulses. The operation of a latch 292 will now be described in conjunction with the receiptl of a spacing signalling impulse on the selector magnet |31. The spacing impulse is an open line condition and therefore the armature extension |66 will be in its lower position as moved by the spring |63. Assuming that this spacing impulse is the first signalling impulse, then during the mid-portion or most effective portion of this impulse, the notch |62 in the first selector` cam |23 will come into operative relation With the projection 293 on the first latch 292.

The latch spring |52 at this time urges the projection 293 into the notch |62, causing the latch to pivot about the pin |49. However, before the projection 293 enters to the full depth of the notch |62, the projection 291 at the upper end of the latch 292 engages with the amature extension |66 and prevents further pivoting of the latch. This` amount of pivoting of the latch 292 is not suflicient to disengage the projection 294 thereon and the projection 296 on the associated selector lever 29|. Thus the associated selector lever 29| is retained in its normal latchcd position and prior to the beginning of the next signalling impulse the notch |63 rotates out of operative relation with the projection 293 and causes the latch 292 to be returned to its normal position.

On a, marking impulse the selector magnet |31 is energized and causes the armature extension |66 to be above and unengageable with the projections 291 on the latches 292. Therefore, in conjunction with marking impulses the spring |52 is allowed to pivot the latches 292 to allow the projections 293 to enter to the full depth of the notch |62 in the selector cams 23. This amount of pivoting of the latch 292 causes the projection 294 thereon to be disengaged with the projection 296 on an associated selector lever. Thereupon a selector spring |59 is effective on its associated selector lever 29| to pull it down into its marking or selected position. The pin |61 limits the downward movement of the selector levers. From this point on the operation and movements of the selected selector levers 292 are identical with those of the selected selectors |51 of the preferred embodiment and it is thought that further description of vtheir movements here is not necessary. Thus the marking and spacing impulses of the signalling impulses are transferred to and represented by their associated selector levers 29| being in their selected and normal positions, respectively.

While this invention has been shown and described in but one form and a single modification thereof, it will be obvious tothose skilled in the art that it is not so limited but is susceptible to various other changesand modifications, without departing from the spirit or essential attributes, and it is desired, therefore, that only such limitations shall be placed thereon as are imposed by the prior art or are specifically set forth in the appended claims.

What is 'claimed is:

l. In a telegraph receiver, a set of selectors having an unselected and a selected position, a set of associated selector latches holding said selectors in their unselected position, each latch having a plurality of varieties of motion, means for determining the variety of motion through which each latch moves, means whereby said latches in one variety of motion unlatch associated selectors and means for actuating each of said unlatched selectors to its selected position.

`moves andtmeans` whereby each of said latches in moving through one of said varieties of motion `unlatchesy its associated selector.

3. In a telegraph recorder', a plurality of selector elements each having a selected and an unselected position, a plurality or latches, one individual to each of said selectors andfnormally latching associated selectors in an unselected position, each latch being pivotable about a plurality of points, a rotatable member with a series of notches therein, said notches being movable past said latches in synchronism with received code combinations of impulses to allow pivotal movement of said latches into said notches, means tending to pivot saidflatches about one of said pivot points, electromagnetic means responsive to received code combinations of impulsesior selecting the effective pivot point of each of said latches for unlatching each selector element upon pivotal movement of its associated latch about a predetermined one of said pivot points.

ll. In a telegraph receiver, a plurality of selectors each having a selected `and an unselected position, a plurality of latches, one individual to each or said selectors and normally latching said selectors in an unselected position, a rotatable member having a "series of elements, each rotatable past its associated latch in synchronism with received code combinations of impulses and invariably actuating the same, an electro-responsivemeans cooperating with said rotatable elements whereby each of said latches `are selectively actuated in accordance with received code combinations of impulses and means for causing selectively operated latches to unlatch their associated selectors.

5. In a telegraph receiver, a plurality of selectors each having` a selected and an unselected position, a plurality of latches, one individual to each of said selectors and normally latching said selectors inan unselected position, each of said latches having two modes of operation, individual means tending to operate said latches, a rotat- `able member for sequentially allowing said latches to operate in synchronism with received permutation impulses, means responsive to received permutation impulses for determining the mode of operation of said latches, positively operating means` for returning said latches to normal following either of saidmodes of operation and means for causing said latches, in Vone of said modes of operation, to unlatch their associated selectors.

6. In a telegraph receiver, a plurality of selectors each having a selected and an unselected position, a plurality of latches, one individual to each of said selectors and normally latching said selectors in an unselected position, each of said latches having a cycle of operation of least normal restraint and a cycle of operation of greater normal restraint, operating means for said latches, means for sequentially conditioning said latches for a cycle of operation in `synchronism with received permutation impulses, electromagnet means operatingwin response to received permutationimpulsesfor selectively controlling the operation of said latches either through the cycle of operation of least normal restraint or through *the cycle of operation of greater normal restraint and meansforunlatching an associated `selector `'during only one of said cycles of operation.

7. In a telegraph receiver, a plurality of selectors each having a selected and an unselected position, a plurality of latches, one individual to each of said selectors and normally latching said `selectors in an unselected position, means responsive to received permutation of impulses for selectively operating said latches to unlatch said selectors, individual resilient means formoving unlatched selectors to a selected position, means operative thereafter for positively operating said selected selectors to control a recording mechanisrn and means comprising said individual resilient means and other positively operating means, operative after said i'lrst positive operation of said selected selectors, for returning said selected selectors to said unselected position.

8. In a telegraph receiver, a plurality of selectors each having a selected and an unselected position, a plurality of latches, one individual to each of said selectors and normally latching said selectors in an unselected position, means respon-V sive to received permutation of impulses for selectively operating said latches `to unlatch said selectors, Vmeans. for moving unlatohed selectors to a selected position, a recording mechanism, means employing only selected selectorsfor` selectively controlling said recording mechanism and means operative thereafter forV relatching said selected selectors in unselected position.

9. In a telegraph receiver, a plurality of selectors each having a selected and an unselected position, a plurality of latches, one individual to each of said selectors and .normally latching said selectors in an unselected position, means responsive to received permutations of impulses for selectively operating said latches to unlatch said selectors, means for moving unlatched selectors to` a selected position, a recording mechanism, means employing selected selectors for selectively controlling said recording mechanism, means operative thereafter for relatching said selected selectors in unselected position, and means for retaining said latches at rest during 'saidrelatching operation. n

10. A telegraph receiving apparatus comprising a series of selectors and an associated series of latches, each of said latches having a plurality of varieties of motion but normally restrained from` motion, power operated means to allow the operation of said latches, signal controlled means to `positively restrain the movement of said latches in one variety of motion and thereby allow the movement thereof in a second variety of motion, in combinations in accordance with received` signals, means comprising said power operated means for positively returning saidV latches to normal from either of said varieties of motion and means for causing said latches, in one variety of motion, to unlatch their associated selectors.

l1. A telegraph receiver comprising a series of movable and normally latched selecting elements, a corresponding and associated series of latches therefor, means for operating said latches in marking and spacing cycles in accordance with received signals to selectively unlatch associated of said selecting elements,` a plurality of notched code members having normal and operated positions, means for moving said notched code members to their normal position in successive order,

means engaging said unlatched selecting elements for moving said code'membersr into their operated positions successively in combinations according tothe position of said selecting elements and means for operating said last two mentioned means in overlapped relation whereby the first notched code member is moved into operated position prior to the movement of the last notched code member to normal.

12. In a telegraph recorder, a first group of selecting members, a series of latches therefor, a second group of selecting members, means for selectively actuating said latches in cyclic order in response to received code combinations of impulses to allow said first group of selecting members to be selectively positioned, transfer means for successively transferring the selection set up in said rst selecting members to said second selecting members, means whereby the transfer of the selection in the rst group of selecting members is started and completed after the selective operation of the last operated latch, printing means and means controlled by said second group of selecting members for controlling said printing means. l

13. In a telegraph receiver, a group of primary members, signal responsive means, a selecting cam acting directly on said members and cooperating with said signal responsive means to selectively control the operation `of the same, a secondary group of members, means for operating the secondary members under control of the selective operation of the associated primary members, a third groupk of 'members andV transfer means for successively transferring the selection set up in the secondary members directly to the third group of members, said transfer operation occurring in a time interval less than that required to actuate the primary members.

14. In a telegraph receiver, a group of primary members, signal responsive means, a selecting cam acting directly on said primary member and cooperating with said signal responsive means to effect selective and'unselective operation thereof under the selective control of line signals, a second group of members having normal and selected positions, means for operating the second members under control of the selective operation of the associated primary members, a third group of members, transfer 'means for successively transferring thel selection set up in said second group of members directly to said third group of members, and means for restoring said second members to normal position, said transfer and restoring operations occurring in less time than that required to actuate the primary members.

15. In atelegraph receiver, a group of primary selectors having normal and selected positionsfa group of latchestherefor normally holding said selectors in normal position, a selecting cam acting directlyv on said latches under the selective control of line signals to allow selective operation thereof whereby said primary selectors are allowed to be selectively positioned, a secondary group of selectors havingnormal and selected positions, means for successively gathering said secondary selectors into their normal position, transfer means for successively transferringv the selection set up in said primary selectors directly to said secondary selectors and means for restoring said primary selectors to their normal position, said gathering, transferring and restoringv operations occurring in a timeinterval less'tha'n that required to actuate the primary selector latches.

16. A telegraph receiving apparatus comprising a series of elements having varieties of motion but normally restrained from motion, individual means tending to operate said elements in said varieties of motion, power operated means for sequentially allowing said elements to operate in substantial synchronism with received signal impulses, signal controlled means to positively restrain the movement of said elements in a first vari-ety of motion whereby said individual operating means moves said elements in a second variety of motion, means individual to each of said elements for returning said elements to normal position against the action of said operating means and means controlled by said elements in said second variety of motion for controlling a recording mechanism.

17. In a selector mechanism, a series of selector elements having a normal latched position, an unlatched position and an operated position, resilient means for moving said elements from latched position to unlatched position, a first power operated means for moving said elements from unlatched position to operated position, resilient means for returning said elements from operated position -to unlatched position and a second power operated means for returning said elements from unlatched position to normal latched position, said selector actuating means operating in the order named.

18. In a selector mechanism, a series of selector elements having a normal position, a partially operated position and a fully operated position, resilient means for moving said elements from normal position to partially operated position, a first power operated means for moving said elements from partially operated position to fully operated position, said resilient means acting to return said elements from fully operated position to partially operated position and a second power operated means for returning said elements from partially operated position to normal position, said selector actuating means operating in the order named.

19. In a selector mechanism, a group of selectors having a normal latched position, an unlatched position and an operated position, an associated group of latches normally latching said selectors in normal position, means for selectively actuating said latches to unlatch associated selectors in accordance with received signal impulses during said signal impulses, individual resilient means for moving said unlatched selectors from normal to unlatched position, a first common power operated means for successively moving said selectors from unlatched to operated position, means comprising said individual resilient means for moving said selectors from operated to unlatched position and a second common power operated means for suc; cessively moving said selectors from unlatched to latched position.

20. In a selector mechanism, a group of selectors having a normal latched position, an unlatched position and an operated positon, an associated group of latches normally latching said selectors in normal position, means for selectively actuating said latches to unlatch associated selectors in accordance with received signal impulses during said signal impulses, individual resilient means for moving said unlatched selectors from normal to unlatched position, as said selectors are unlatched, a power operated means successively associated with said unlatched selector for` positively moving such selectors from unlatched to operated position and concomitant- `ly tensioning said resilient means, said power operating means thereafter. successively allowing said resilient means to return said selector from operated to unlatched position, said last two operations occurring in overlapped' relation whereby said selectors are not all in operated position simultaneously and means comprising said power operated means operative thereafter for successivelymoving-said unlatched selectors from unlatched to latched position, l

21. In 'a selector mechanism, a'group of selectors having normal and operated positions, an associated group of selector latches normally `latching saidv selectors in normal position, said latches being pivotable about two points adja' cent either end thereof, means for normally pivoting said latches about one of these points, means adjacent the normal pivot point of each latch for latching associated selectors, power A operated means for successively allowing said latches to pivot about one or the other of said pivot points vin synchronism with received signal impulses, means responsive to received signal impulses for determining about which of said pivot points said latches pivot and means Vfor disengaging said latching means when said latches pivot about the point other than said normalpivot point. l 1

225111 `a selector mechanism, af groupof selectors having normal and operated positions, an associated group of selector latches i normally latching said selectors in normal position, said latches being pivotable about two points adjacent either end thereof and normally pivoting about` one of these points, individual resilient means for pivoting said latches, rotatable means operating in synchronism with received signal impulses for successively allowing said `resilient means to pivot said latches, said resilient means and said rotatable means being attached to and operating on said latches respectively at points intermediate the pivot` points, electromagnetic means for determining the pivot-point of said latches in accordance with received signal impulses, means whereby said latches unlatch assciated selectors in pivoting about the off-normal pivot point and means comprising said rotatable member for positively returning said latches to normal during the receipt of respective signal impulses.`

pivot point and thereby preventing further such pivoting, said latches thereafter pivoting about a point in contact with said electromagnetically operated member and means whereby said latches in pivoting about said last mentioned pivot point unlatch associated selectors.

24. In a selecting mechanism, a group of selectors having normal and selected positions, an

associated group of pivotable selector latches normally latching said selectors in normal position, pivoting means for said latches, rotatable means operating in synchronism with received code combinations of impulses for-successively allowing said pivoting means to pivot said latches, said latches invariably starting to pivot about a predetermined point thereof, a member electromagnetically operated in response to received code combinations of impulses, means` comprising said member for selectively preventing substantially all pivoting motion of said latches about said predetermined pivot point and concomitantiy allowing further pivoting of said selector about said member and means for unlatching associated selectors when said latches pivot about said electromagnetically operated member. u

25, Ina telegraph receiver, a plurality of selectors each having a selected and an unselected position, a plurality of latches, one individual to each of said selectors and normally latching said selectors in an unselected position, each of said latches having a cycle of operation of least normal restraint and a cycle of operation of greater normalrestraint, operating means for said latches, means for sequentially conditioning said latches for operation in synchronism with received permutation impulses, .electro-magnet means operating in response to received permutationimpulses for selectively controlling the operation of said? latches either through the cycle of operation of least normalrestraint or through the cycleof `operation of greater normal restraint, and means for causing said latches toI unlatch their associated selectors during the cycle of operation of greater normal restraint.

26. In a telegraph receiver, a plurality of latchable selector elements having anormal latched and a selected unlatched position, means for selectively unlatching said elements in response to and in accordance with received code combinations of impulses, a typewheel positioning mechanism, means operative only Von unlatched ones of said selector Yelements to selectively control said typewheel positioning mechanism and means operative thereafter for relatching unlatched of said selector elements.

27. A telegraph receiver comprising a series of elements each having a normal cycle of operation and a selected cycle of operation, means operative to actuate said elements in successive order, signal controlled means operative in accordance with received impulses to select the cycle of operation of each of said elements, a recording mechanism, means released by said elements in said selected cycle of operation, means for operating said released means and meansemploying said released means to selectively control said recording mechy anism.

1y to said secondary selectors and means for restoring said primary selectors to their normal position, said gathering and transferring operations occurring in overlapped relation and in a time interval less than that required to actuate the primary selector latches.

29. In a selecting mechanism, a plurality of selecting members having a normal and a selected position, means .tending to actuate said selectors f to selected position, a-set of latches normally reposition, a single magnet responsive to receivedY combinations of impulses and cam members acting directly on said vlatches for selectively effecting predetermined operation` of said latches to allow the selective positioning "of associated selecting `members in accordance with said impulses, a typewheel stop mechanism, means to further actuate said selectively positioned selecting members to control said typewheel stop mechanism and means for restoring said selectively positioned selecting members to their normal position.`

f 30. In a telegraph receiver, a series of selectors having a normal and a selected position, an associated series'of latches normally latching said selectors in normal position, said latches being normally pivotable about a point adjacent one end thereof, means tending to pivot said latches, a rotatable member for sequentially allowing said pivoting means to operate in synchronism with received signal impulses, electromagnetic operated means for selectively preventing the pivoting of said latches about said normal pivoting point and allowing the pivoting Athereof about a point Vadjacent the other end 'and means whereby said last mentioned pivoting operation causes the unlatching of associated selectors.

3l. In a selector'mechanism, a group of selectors having a normal latched position, an unlatched position and an operated position, an associated group of latches normally latching said selectors in normal position, means for selectively actuating said latches to unlatch associated selectors in accordance with received signal irnpulses during said signal impulses, individual resilient means for moving said unlatched selectors from normal to unlatched position, as said selectors are unlatched, a power operated means successively associated with said unlatched selectors for positively moving such selectors from unlatched to operated position and concomitantly tensioning said resilient means, said power operating means thereafter successively allowing said resilient means to return said selector from operated-to unlatched position, said last two operations occurring in overlapped` relation whereby said selectors are not all in operated position simultaneously, means comprising said power operated means operative thereafter for successively moving said unlatched selectors from unlatched to latched position and concomitantly tensioning said resilient means, and means for performing said last two operations in overlapped relation whereby ther movement of the iirst selector to latched position occurs prior to the movement of the lastselector to unlatched position.

32. In a telegraph receiver, a plurality of selector elements each having a selected and an unselected position, a plurality of latches, one individual to each of said selector elements and normally latching said selector elements in an unselected position, `signal responsive means, means cooperating with said signal responsive means for selectively operating said latches to successively unlatch vsaid selector elements in accordance with received code combinations of impulses, individual resilient means for moving unlatched of said selector elements to a selected position, .a recording mechanism, means employing only unlatched Vof said selector elements for selectively controlling said recording mechanism and means operative following the operation of said last mentioned means for camming unlatched of said selector elements past associated of said latches whereby said selector elements are relatched in normal position.

33. In a telegraph receiver, a plurality of selector elements, each having anormal and selected position, a latch individual to each of said selector elements normally latching said selectors in ra normal position, means responsive to received permutations of impulses for selectively actuating said latches to unlatch associated selector elements, means for linearly moving unlatched of said selector elements to a selected position, a recording mechanism and means employing unlatched Vof said selector elements for selectively controlling said recording mechanism.

l34:. In a telegraph receiver, a plurality of selector elements each having a normal and selected position, a latch individual to each of said selector elements normally latching said selector elements in a normal position, means responsive'to received permutations of impulses for selectively .actuating said latches to successively unlatch associated'of saidy selector elements, individual resilient means for linearly moving unlatched of said selector elements to a selected position, a recording mechanism and means employingonly unlatched of said selector elements for selectively controlling said recording mechanism, means operative following the operation of said last 'mentioned means for relatching unlatched of said selector elements and means whereby said selector Aelements in said relatching operation have a combined linear and pivoting movement.

35. In a selector mechanism, a series of selector elements having a normal position, a partially operated position and a fully operated position, resilient means for linearly moving said elements from normal position to partially operated position, a rst power operated means for pivotally v-moving said elements from partially operated position to fully operated position, said resilient means acting to return said elements from fully operated position to partially operated position, and a second power operated means for returning said elements in a combined pivoting and linear movement from partially operated position to normal position, said selector actuating means operating in the order named.

ROBERT F. DIRKES. 

